Journal
ADVANCED SYNTHESIS & CATALYSIS
Volume 352, Issue 2-3, Pages 293-298Publisher
WILEY-V C H VERLAG GMBH
DOI: 10.1002/adsc.200900663
Keywords
alcohols; oxidation; oxygen; palladium; polyoxometalates
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Funding
- German-Israeli Project Cooperation [DIP-G7.1]
- Israel Science Foundation
- US-Israel Binational Science Foundation
- Kimmel Center for Molecular Design
- Bernice and Roger Cohn Center for Catalysis
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A hexadecyltrimethylammonium salt of a sandwich type polyoxometalate has been used as a ligand to attach a palladium(II) center. This Pd-POM compound was an active catalyst for the fast aerobic oxidation of alcohols. The unique property of this catalyst is its significant preference for the oxidation of primary versus secondary aliphatic alcohols. Since no kinetic isotope effect was observed for the dehydrogenation step, this may be the result of the intrinsically higher probability for oxidation of primary alcohols attenuated by steric factors as borne out by the higher reactivity of I-octanol versus 2-ethyl-1-hexanol. The reaction is highly selective to aldehyde with little formation of carboxylic acid, autooxidation is inhibited. No base is required to activate the alcohol. The fast reactions appear to be related to the electron-acceptor nature of the polyoxometalate ligand that may also facilitate alcohol dehydrogenation in the absence of base.
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